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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/asm-m68k/bitops.h
4 * Copyright 1992, Linus Torvalds.
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
11 #ifndef _LINUX_BITOPS_H
12 #error only <linux/bitops.h> can be included directly
15 #include <linux/compiler.h>
18 * Require 68020 or better.
20 * They use the standard big-endian m680x0 bit ordering.
23 #define test_and_set_bit(nr,vaddr) \
24 (__builtin_constant_p(nr) ? \
25 __constant_test_and_set_bit(nr, vaddr) : \
26 __generic_test_and_set_bit(nr, vaddr))
28 #define __test_and_set_bit(nr,vaddr) test_and_set_bit(nr,vaddr)
30 static inline int __constant_test_and_set_bit(int nr
, unsigned long *vaddr
)
32 char *p
= (char *)vaddr
+ (nr
^ 31) / 8;
35 __asm__
__volatile__ ("bset %2,%1; sne %0"
36 : "=d" (retval
), "+m" (*p
)
42 static inline int __generic_test_and_set_bit(int nr
, unsigned long *vaddr
)
46 __asm__
__volatile__ ("bfset %2{%1:#1}; sne %0"
47 : "=d" (retval
) : "d" (nr
^31), "o" (*vaddr
) : "memory");
52 #define set_bit(nr,vaddr) \
53 (__builtin_constant_p(nr) ? \
54 __constant_set_bit(nr, vaddr) : \
55 __generic_set_bit(nr, vaddr))
57 #define __set_bit(nr,vaddr) set_bit(nr,vaddr)
59 static inline void __constant_set_bit(int nr
, volatile unsigned long *vaddr
)
61 char *p
= (char *)vaddr
+ (nr
^ 31) / 8;
62 __asm__
__volatile__ ("bset %1,%0"
63 : "+m" (*p
) : "di" (nr
& 7));
66 static inline void __generic_set_bit(int nr
, volatile unsigned long *vaddr
)
68 __asm__
__volatile__ ("bfset %1{%0:#1}"
69 : : "d" (nr
^31), "o" (*vaddr
) : "memory");
72 #define test_and_clear_bit(nr,vaddr) \
73 (__builtin_constant_p(nr) ? \
74 __constant_test_and_clear_bit(nr, vaddr) : \
75 __generic_test_and_clear_bit(nr, vaddr))
77 #define __test_and_clear_bit(nr,vaddr) test_and_clear_bit(nr,vaddr)
79 static inline int __constant_test_and_clear_bit(int nr
, unsigned long *vaddr
)
81 char *p
= (char *)vaddr
+ (nr
^ 31) / 8;
84 __asm__
__volatile__ ("bclr %2,%1; sne %0"
85 : "=d" (retval
), "+m" (*p
)
91 static inline int __generic_test_and_clear_bit(int nr
, unsigned long *vaddr
)
95 __asm__
__volatile__ ("bfclr %2{%1:#1}; sne %0"
96 : "=d" (retval
) : "d" (nr
^31), "o" (*vaddr
) : "memory");
102 * clear_bit() doesn't provide any barrier for the compiler.
104 #define smp_mb__before_clear_bit() barrier()
105 #define smp_mb__after_clear_bit() barrier()
107 #define clear_bit(nr,vaddr) \
108 (__builtin_constant_p(nr) ? \
109 __constant_clear_bit(nr, vaddr) : \
110 __generic_clear_bit(nr, vaddr))
111 #define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)
113 static inline void __constant_clear_bit(int nr
, volatile unsigned long *vaddr
)
115 char *p
= (char *)vaddr
+ (nr
^ 31) / 8;
116 __asm__
__volatile__ ("bclr %1,%0"
117 : "+m" (*p
) : "di" (nr
& 7));
120 static inline void __generic_clear_bit(int nr
, volatile unsigned long *vaddr
)
122 __asm__
__volatile__ ("bfclr %1{%0:#1}"
123 : : "d" (nr
^31), "o" (*vaddr
) : "memory");
126 #define test_and_change_bit(nr,vaddr) \
127 (__builtin_constant_p(nr) ? \
128 __constant_test_and_change_bit(nr, vaddr) : \
129 __generic_test_and_change_bit(nr, vaddr))
131 #define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
132 #define __change_bit(nr,vaddr) change_bit(nr,vaddr)
134 static inline int __constant_test_and_change_bit(int nr
, unsigned long *vaddr
)
136 char *p
= (char *)vaddr
+ (nr
^ 31) / 8;
139 __asm__
__volatile__ ("bchg %2,%1; sne %0"
140 : "=d" (retval
), "+m" (*p
)
146 static inline int __generic_test_and_change_bit(int nr
, unsigned long *vaddr
)
150 __asm__
__volatile__ ("bfchg %2{%1:#1}; sne %0"
151 : "=d" (retval
) : "d" (nr
^31), "o" (*vaddr
) : "memory");
156 #define change_bit(nr,vaddr) \
157 (__builtin_constant_p(nr) ? \
158 __constant_change_bit(nr, vaddr) : \
159 __generic_change_bit(nr, vaddr))
161 static inline void __constant_change_bit(int nr
, unsigned long *vaddr
)
163 char *p
= (char *)vaddr
+ (nr
^ 31) / 8;
164 __asm__
__volatile__ ("bchg %1,%0"
165 : "+m" (*p
) : "di" (nr
& 7));
168 static inline void __generic_change_bit(int nr
, unsigned long *vaddr
)
170 __asm__
__volatile__ ("bfchg %1{%0:#1}"
171 : : "d" (nr
^31), "o" (*vaddr
) : "memory");
174 static inline int test_bit(int nr
, const unsigned long *vaddr
)
176 return (vaddr
[nr
>> 5] & (1UL << (nr
& 31))) != 0;
179 static inline int find_first_zero_bit(const unsigned long *vaddr
,
182 const unsigned long *p
= vaddr
;
189 size
= (size
+ 31) >> 5;
190 while (!(num
= ~*p
++)) {
195 __asm__
__volatile__ ("bfffo %1{#0,#0},%0"
196 : "=d" (res
) : "d" (num
& -num
));
199 return ((long)p
- (long)vaddr
- 4) * 8 + res
;
202 static inline int find_next_zero_bit(const unsigned long *vaddr
, int size
,
205 const unsigned long *p
= vaddr
+ (offset
>> 5);
206 int bit
= offset
& 31UL, res
;
212 unsigned long num
= ~*p
++ & (~0UL << bit
);
215 /* Look for zero in first longword */
216 __asm__
__volatile__ ("bfffo %1{#0,#0},%0"
217 : "=d" (res
) : "d" (num
& -num
));
219 return offset
+ (res
^ 31);
222 /* No zero yet, search remaining full bytes for a zero */
223 res
= find_first_zero_bit(p
, size
- ((long)p
- (long)vaddr
) * 8);
227 static inline int find_first_bit(const unsigned long *vaddr
, unsigned size
)
229 const unsigned long *p
= vaddr
;
236 size
= (size
+ 31) >> 5;
237 while (!(num
= *p
++)) {
242 __asm__
__volatile__ ("bfffo %1{#0,#0},%0"
243 : "=d" (res
) : "d" (num
& -num
));
246 return ((long)p
- (long)vaddr
- 4) * 8 + res
;
249 static inline int find_next_bit(const unsigned long *vaddr
, int size
,
252 const unsigned long *p
= vaddr
+ (offset
>> 5);
253 int bit
= offset
& 31UL, res
;
259 unsigned long num
= *p
++ & (~0UL << bit
);
262 /* Look for one in first longword */
263 __asm__
__volatile__ ("bfffo %1{#0,#0},%0"
264 : "=d" (res
) : "d" (num
& -num
));
266 return offset
+ (res
^ 31);
269 /* No one yet, search remaining full bytes for a one */
270 res
= find_first_bit(p
, size
- ((long)p
- (long)vaddr
) * 8);
275 * ffz = Find First Zero in word. Undefined if no zero exists,
276 * so code should check against ~0UL first..
278 static inline unsigned long ffz(unsigned long word
)
282 __asm__
__volatile__ ("bfffo %1{#0,#0},%0"
283 : "=d" (res
) : "d" (~word
& -~word
));
290 * ffs: find first bit set. This is defined the same way as
291 * the libc and compiler builtin ffs routines, therefore
292 * differs in spirit from the above ffz (man ffs).
295 static inline int ffs(int x
)
299 asm ("bfffo %1{#0:#0},%0" : "=d" (cnt
) : "dm" (x
& -x
));
303 #define __ffs(x) (ffs(x) - 1)
306 * fls: find last bit set.
309 static inline int fls(int x
)
313 asm ("bfffo %1{#0,#0},%0" : "=d" (cnt
) : "dm" (x
));
318 #include <asm-generic/bitops/fls64.h>
319 #include <asm-generic/bitops/sched.h>
320 #include <asm-generic/bitops/hweight.h>
321 #include <asm-generic/bitops/lock.h>
323 /* Bitmap functions for the minix filesystem */
325 static inline int minix_find_first_zero_bit(const void *vaddr
, unsigned size
)
327 const unsigned short *p
= vaddr
, *addr
= vaddr
;
334 size
= (size
>> 4) + ((size
& 15) > 0);
335 while (*p
++ == 0xffff)
338 return (p
- addr
) << 4;
342 __asm__
__volatile__ ("bfffo %1{#16,#16},%0"
343 : "=d" (res
) : "d" (num
& -num
));
344 return ((p
- addr
) << 4) + (res
^ 31);
347 #define minix_test_and_set_bit(nr, addr) __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
348 #define minix_set_bit(nr,addr) __set_bit((nr) ^ 16, (unsigned long *)(addr))
349 #define minix_test_and_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
351 static inline int minix_test_bit(int nr
, const void *vaddr
)
353 const unsigned short *p
= vaddr
;
354 return (p
[nr
>> 4] & (1U << (nr
& 15))) != 0;
357 /* Bitmap functions for the ext2 filesystem. */
359 #define ext2_set_bit(nr, addr) __test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
360 #define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
361 #define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
362 #define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
364 static inline int ext2_test_bit(int nr
, const void *vaddr
)
366 const unsigned char *p
= vaddr
;
367 return (p
[nr
>> 3] & (1U << (nr
& 7))) != 0;
370 static inline int ext2_find_first_zero_bit(const void *vaddr
, unsigned size
)
372 const unsigned long *p
= vaddr
, *addr
= vaddr
;
378 size
= (size
>> 5) + ((size
& 31) > 0);
382 return (p
- addr
) << 5;
386 for (res
= 0; res
< 32; res
++)
387 if (!ext2_test_bit (res
, p
))
389 return (p
- addr
) * 32 + res
;
392 static inline int ext2_find_next_zero_bit(const void *vaddr
, unsigned size
,
395 const unsigned long *addr
= vaddr
;
396 const unsigned long *p
= addr
+ (offset
>> 5);
397 int bit
= offset
& 31UL, res
;
403 /* Look for zero in first longword */
404 for (res
= bit
; res
< 32; res
++)
405 if (!ext2_test_bit (res
, p
))
406 return (p
- addr
) * 32 + res
;
409 /* No zero yet, search remaining full bytes for a zero */
410 res
= ext2_find_first_zero_bit (p
, size
- 32 * (p
- addr
));
411 return (p
- addr
) * 32 + res
;
414 static inline int ext2_find_first_bit(const void *vaddr
, unsigned size
)
416 const unsigned long *p
= vaddr
, *addr
= vaddr
;
422 size
= (size
>> 5) + ((size
& 31) > 0);
423 while (*p
++ == 0UL) {
425 return (p
- addr
) << 5;
429 for (res
= 0; res
< 32; res
++)
430 if (ext2_test_bit(res
, p
))
432 return (p
- addr
) * 32 + res
;
435 static inline int ext2_find_next_bit(const void *vaddr
, unsigned size
,
438 const unsigned long *addr
= vaddr
;
439 const unsigned long *p
= addr
+ (offset
>> 5);
440 int bit
= offset
& 31UL, res
;
446 /* Look for one in first longword */
447 for (res
= bit
; res
< 32; res
++)
448 if (ext2_test_bit(res
, p
))
449 return (p
- addr
) * 32 + res
;
452 /* No set bit yet, search remaining full bytes for a set bit */
453 res
= ext2_find_first_bit(p
, size
- 32 * (p
- addr
));
454 return (p
- addr
) * 32 + res
;
457 #endif /* __KERNEL__ */
459 #endif /* _M68K_BITOPS_H */